Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

7CAF19

ICAO 24-bit transponder address · allocated to Australia

Hex
7CAF19
Octal
37127431
Decimal
8,171,289
Country
AU
No current signal · last broadcast 1d ago
Flights observed
4
Distinct callsigns
2
Country
AU
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 7CAF19.

Country allocation

The ICAO 24-bit address 7CAF19 falls within the block assigned to Australia (AU) by ICAO Annex 10, Volume III. Every aircraft registered in Australia receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 2 distinct

Callsign Airline Flights Last seen
BOE123 - 2 2026-05-23
BOE029 - 1 2026-05-28

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-05-28 BOE029 - May 28, 16:55 UTCMay 28, 19:25 UTC2h 30m
2026-05-26 - RNT → RNT May 26, 15:20 UTCMay 26, 15:24 UTC5m
2026-05-23 BOE123 RNT → RNT May 23, 02:30 UTCMay 23, 03:15 UTC45m
2026-05-23 BOE123 RNT → RNT May 23, 00:00 UTCMay 23, 01:20 UTC1h 20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Mode-S 7CAF19 frequently asked

What is Mode-S code 7CAF19?
7CAF19 is an ICAO 24-bit transponder address. Allocated to Australia.
Where is Mode-S 7CAF19 registered?
Mode-S code 7CAF19 is allocated to Australia (AU). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7CAF19 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7CAF19, octal 37127431, decimal 8,171,289.
What flights does 7CAF19 operate?
Mode-S 7CAF19 has broadcast 2 distinct callsigns, including BOE123, BOE029.